Screw-driver



(No Model.)

T. G. MOUAT.

SCREW DRIVER.

Patented July 20, 1886.

UNITED STATES PATENT OFFICE.

THOMAS G. G. MOUAT, OF DETROIT, MICHIGAN.

SCREW-DRIVER.

SPECIFICATION forming part of Letters Patent No. 346,058, dated July 20, 1886.

Serial No.194,6-24. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS G. G. MoUAT, of Detroit, county of Wayne, State of Michigan, have invented a new and useful Improvement in Ratchet Screw-Drivers; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form a part of this specification.

My invention is designed to provide an improved ratchet screwdriver, which shall also be adapted for analogous uses-as, for instance, a borer and a ratchet-brace; and it consists of the combinations of devices and applianees hereinafter specified, and more particularly pointed out in the claims.

In the drawings, Figure 1 is a View in ele- Vation. Fig. 2 is a horizontal section showing parts in plan; Fig. 3, a horizontal section showing parts in elevation.

My invention is designed more especially to provide a screwdriver whichmay be used in limited spaces. In certain kinds of work where parts are to be fastened together by screws there is no room for the operation of an ordinary hand screw-driver large enough to stand the strain and apply the power desired to drive the screw.

My invention provides an instrument by which screws can be driven and withdrawn where but little room is given for the operation.

My invention also provides a screw-driver of great power which may be readily operated for driving or withdrawing the screw, as it may be instantaneously adjusted to work in either directionr It also provides for the application of power upon the screw, if desired, in forcing it home.

The device is so constructed, moreover, that the screw may be started by hand without the application of the ratchet mechanism connected therewith.

I carry out my invention as follows: A is a holder provided with asoeket, a, for receiving the tool B. This socket may be provided with any ordinary means for securing the tool in placeas, for instance, a set-screw, a. The

holder is provided with a stem, A, provided with a ratchet-wheel, 0, located thereon.

D is a cap into which the stem of the holder is sleeved, so as to be rotatable therein. This cap affords ready means for liandprcssure to be applied to the holder. It may be held in place by recessing the stem, as shown at (d, the cap being provided with a screw, (1, engaged in said recess.

E is a handle or lever engaged at one end upon the stem of the holder, as shown, said lever provided with an cscapement-pawl, F, pivotally connected therewith, so as to be readily adjusted to engage the ratchet-wheel at either point. This cscapement-pawl is constructed with a point, f, which is engaged by a spring-bar, G. H is a housing for said spring-bar. The construction of the springbar and its adjustment to the cscapement is such that the bar will yield to permit the escapement being turned to throw either point in connection with the ratchet-whcel, the

spring-bar bearing against the corresponding side of the point f to hold the ratchet in its adjusted position, the pawl being adjusted to operate the ratch et-wheel in the desired direction. The handle may be then operated so as to throw the ratchet-wheel in the desired direction, thereby rotating the holder and the tool engaged therein. Should it be desired to operate the tool in the opposite direction, the position of the cscapement is adjusted to correspond. By this means the tool may be operated in either direction, as desired, simply by a change of the position of the cscapementpawl. It will be observed that this lever, operating through the pawl upon the ratchetwheel, affords great power in the operationof the tool.

Should it be desired to start a screw before the application of power by the lever, any suitable means may be employed to lock the cap upon the stem of the holder-as, for instance, the cap D may be provided with a slide, d, arranged to be thrown into any of the spaces between the teeth of the ratchetwhecl, which will permit the operation of the tool without the application of power by the lever or handle. By withdrawing this'slide the power may be applied to the tool, as already described. It is evident that the handle or lever E may be engaged, if desired, in a stock, I, whereby it might be operated as shown in Fig. 3, thereby increasing its power and adapting'it for a b0ring-tool or drill.

What I claim is- 1. The combination of a handle or lever carrying a pawl, a tool-holder having a stem journaled in the handle or lever, a ratchet- Wheel secured to the stem and engaged by the pawl 011 the handle or lever, and a cap sleeved upon the stem above the ratchet-wheel, substantially as described.

2. The combination of a handle or lever carrying a pawl, a tool-holder having a stem journaled in the handle or lever, and having an annular recess, a ratchetwheel secured to the stem below the recess, a cap loose on the V TH OMAS G. Gl MOUAT.

Vitnesses: I

M. B. ODOGHERTY, SAMUEL E. THOMAS. 

